acchimuitehoi: (Default)
Tanegashima Shuuji ☆ 種ヶ島修二 ([personal profile] acchimuitehoi) wrote in [personal profile] sanada_g 2018-07-19 03:22 am (UTC)

Pretty sure you'll need diluted muriatic acid to not damage the rock - that's what is used on masonry and concrete to my knowledge. ☆

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